The Wall (the medieval one!)
The best introduction to Girona is to go to Plaça Catalunya, 5 minutes walk from the apartment, and from there start the walk around the old wall of Girona (la Muralla). The views are magnificent and you will get your bearings. You look down on the old town and in the distance might see snow in the Pyrenees.
The wall i am referring to here, the one in the photo, is the medieval wall. The Roman wall is a different circuit altogether - see Walks from Girona section.
Probably better to do the Roman wall walk first as it shows you the perimeter of the true beginnings of 'Gerunda'. The medieval wall meets the roman wall at a right angle at the Telegraph Tower (in the centre of the first photo below).
Sometimes, about half way along, the door in one of the towers is closed and you have to retrace your steps. If so, find time if you can, to go to the beginning of the other end of the wall, to be found near Sant Felix Church (Plaça de Sant Domenec) where you get another wonderful perspective on Girona old town and also some gardens to visit.
The wall takes you to the Cathedral, which you can pay a visit with an audioguide. There is the famous tapestry of the Creation inside and the church has the widest vaulted nave in Europe. The video of the different construction periods of the Cathedral is interesting.
These are near the Cathedral and are definitely worth a visit if there are no queues.
Again nearby. The Jewish museum is informative, if you have time and energy.
Sant Pere Galligants Monastery
This church and the Sant Nicolas Church in the same square are both marvellous examples of Romanesque architecture. There is a museum upstairs of archeological finds. There are cafes close-by for a much needed sit-down.
There's still time to go home for a siesta and shower, out again refreshed for supper.